Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d406607be7f3769…

MALICIOUS

PDF

84.3 KB Created: 2021-03-26 06:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b7c8406d092feb9ddad04b727c92f99e SHA-1: 97ce94fe91a148ef4c3898ceec3898e5c4a19861 SHA-256: 8d406607be7f37698d08496229997e25caf665ed57920d047897f6f14ae77520
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/wix?keyword=jumper+steven+gould+pdf+free+download PDF link annotation
    • http://natorg.fun/3211891854564hpv.pdfIn PDF document text
    • http://studytogether.fun/buzozixawemojusabeteranizpwm79.pdfIn PDF document text
    • https://jiwalevimube.weebly.com/uploads/1/3/4/8/134870165/keriwowojabogimox.pdfIn PDF document text
    • https://xakokizape.weebly.com/uploads/1/3/4/3/134343218/gopaviwe.pdfIn PDF document text
    • http://eurosett.net/jasoxuma7ihos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widifusi.myartsonline.com/86289917059.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_4f734a3b876641ad96a82bc8e4afe341.pdf?index=trueIn PDF document text
    • http://bopisumeku.atwebpages.com/how_to_pair_cochlear_mini_mic_2.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_49114d12b832414384cbd9c9a05c9a68.pdf?index=trueIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_6b6ef2884622449cb22080dbd3a1fdc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e32363-e4bb-455c-9ffc-807fc85a37bc/how_to_sync_skullcandy_push_wireless_earbuds.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_a4d86ea383934ccd84def3a046ca04bd.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_1c1af032f3164b378b98ed322600313b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5f9177-4966-4f75-9eeb-2cbf36e91a73/yamaha_dgx_660b.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_e64a01166181415fa60f4c1a4c893091.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fbb4098-19b2-43af-8207-219e854d721b/36474394209.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_d36e3d0347e4431e81212e8740bac489.pdf?index=trueIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_9cdc5fa56751421188533c9a43a1ed96.pdf?index=trueIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_ae2ca582cdfd4249a34c09cec7c3b9e9.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_1f7dd9fa6ba94fe3b6f6e630da2fb181.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 5500 bytes
SHA-256: 556b1bd5ba2d84b99deafd4fc7e202c30d27b0f299e003459b9c2da0e50fbc48
font_01_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 11108 bytes
SHA-256: ad0d5363b0f27fba62b660cfb04088755c2be077931b081fdff07f4b4f837d99